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animal
>
Lo is a wide-angle
宽角螺属
platyceras
腹足类(螺类)的绝灭属。化石产于志留系到二迭系。其独特的形状易于辨识。像便帽的壳前面高而宽,后面(顶部)微微卷曲成不对称的式样。后部保存较完善,前部往往破裂。该属在泥盆系尤其丰富。